BBD-MN3010 and MN3011- is a MN3101 clock necessary?

[Theo]

What about a 4017 and some 3 input exor gates.
(diodes may work as well)

Cheers Theo

----- Original Message ----- 
From: Mike I. <mirwin1 at istar.ca>
To: <synth-diy at node12b53.a2000.nl>
Sent: Thursday, May 04, 2000 5:59 PM
Subject: Re: BBD-MN3010 and MN3011- is a MN3101 clock necessary?


> Finally got a dual-trace scope. That done, one of the first things to 
> look at was the outputs of the MN3102 clock chips in two analog delay 
> units. The first unit had an MN3102 driving an MN3207 1024-stage NMOS 
> BBD, the second unit had a MN3102 driving an MN3205 4096-stage NMOS BBD. 
>  Both units showed leading-edge and trailing-edge windows (about 250 
> nanoseconds) where the clock lines were simultaneously low. This 250 nS 
> window time stayed constant as the frequency was swept from 12 KHz to 
> 200 KHz. A 9 volt power supply was used. Rise and fall times were about 
> 30 - 50 nS. The MN3205 capacitance (2800 pF) slowed the clock rise and 
> fall times, but the full voltage swing was still there. The MN3102 
> datasheet has a block diagram which indicates that the chip contains an 
> oscillator, divide by two circuit, waveshaper, output buffers, and bias 
> generator, but does not say much about the waveshaping. The accompanying 
> data sheets for the BBD chips indicate that they should be driven with a 
> biphase clock where the overlap between the two waveforms ("crossover" 
> on the data sheet) occurs at zero volts to a maximum of 0.3 * (clock 
> high voltage). (True non-overlapping clocks would have a waveform 
> crossover at zero volts) . Next, took a look at the outputs of a CD4013B 
> driving an SAD1024 and saw the overlap occurring at half the supply 
> voltage, as expected. So, IF it is desirable that a real non-overlapping 
> clock be used, the MN3102 (and probably also the MN3101) are an easy way 
> to do it. An earlier message in this thread suggested that very brief 
> overlap might be better than no overlap in maximizing BBD performance. 
> Mike I.